Each tier is dowelled separately, the common height of a tier being approximately 4".
Are you looking for a 16" center dowel?
Common cake construction methods:
http://tinyurl.com/y22z72
(Has complete and accurate directions.)
HTH
I have seen very long "dowels" not sure that they are cake dowels but the very same thing in home depot in their lumber area. they are all different sizes in diameter, some are the same exact diameter as 'cake dowels' except they sell them very long (10 feet). I have seen also this same dowels in hobby lobby
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